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Protons are positively charged subatomic particles found within the atomic nucleus. Along with neutrons, they form the building blocks of all matter in the universe. The number of protons in an atom determines its atomic number, which in turn dictates its chemical properties. One of the defining features of a proton is its positive charge, which is equal in magnitude to the negative charge of an electron. This charge balance is crucial for maintaining the stability of an atom. Protons also play a key role in the process of nuclear fusion, which powers the sun and other stars. In addition to their role in atomic structure, protons have practical applications in diverse fields such as medicine, research, and industry. Proton therapy, for example, is a cutting-edge cancer treatment that targets tumors with high precision. Overall, protons are integral to our understanding of the universe and have far-reaching implications for scientific advancement.